I always had this feel that the slots are rigged. I always stayed away from the slots... I don't know, I just didn't like them. Blackjack, dice, roulette and poker are my favorites.
Dice is really my favorite since it is so easy to bet. Slots are good too but as what you've said it is rigged. Maybe we can't tell that all slots game are rigged, maybe there are only selected casinos which offer rigged slots.
Because all those slot games need only luck to win the game and since we can't earn money from these games so quickly. Naturally, we all think these games are rigged. But if we play on any trusted sites then mostly they may not be rigged. All these probably games end results we can't guess, and it only depends on luck, so mostly we end up losing money if we gamble for a longer period.